\begin{tabular}{|r||r@{}l|r|r@{ / }r|}\hline\hline
\mc{6}{|c|}{Average Cost of Treatment}\\\hline\hline
Population & \mc{2}{c|}{Estimand} & p-value & \mc{2}{c|}{90\% Confi.}\\\hline
\mc{1}{|l||}{ Full } &           0.068 & $^{**}$ &            0.01 &           0.024 &           0.143 \\
\mc{1}{|l||}{ Treated } &           0.043 & $^{**}$ &            0.02 &           0.017 &           0.139 \\
\mc{1}{|l||}{ Untreated } &           0.086 & $^{***}$ &            0.01 &           0.028 &           0.148 \\
\hline\hline
